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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0990291cbf207929281ef8c0ce6d9d944b3f465060dcc897b83771f5355446fe' 
  AND token = 'VZFBwVqogtjcCwiPf7og9X0ZeFxTAIhEESZoE9a0y3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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