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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7656cd86604e5bf9980d3ed86bf137d31dbf46ab5580b9655012b6abefed94a' 
  AND token = '22rgwW/tW7B92xw9feesGM/PeDmJwubRA7dB6zIilpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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