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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05225d75accd8b6e53aeb0a840777cde68cd5f29be66c1b77882aa858df9ecde' 
  AND token = '0wDsEBJ2JrIqrQ8rzgNVQ5JM7F0BC/tpwC87B1c+mFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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