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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5445f9058e24a39ca08c446faea091a57d60e649748e2277a4e72ce6cd9437d' 
  AND token = 'R/27MWKZ+bkCaWTKv15q0JiIIcsLMt69OfdqsaTLR4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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