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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c2a3947f2de371c43c58f6f435d23663bd7a486a1f207cd6070a34553b0451' 
  AND token = '+/bwE01p9HoqriNsyaT8gcHjZb155+5aefEexjL/has=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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