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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7e2b09c311197f541311c9abeae1a07bab2932eedf68cbf96fb7136b6738bb' 
  AND token = 'bVIROrADmpa5PR5wjJdWJ5IkVrgoINRcG39LtDH71IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}