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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42830b1fe1e2d499277fce152c264fc57726810b720b6219ef0e0b96a2209da' 
  AND token = '+6zmfcPCWEU4E1QsF+8JyCpf1jhbAtbEGPNygZNWTu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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