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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0690d3edb2f25de1b277824125ee630f73570c1e0ab0e8e247852259260d0d' 
  AND token = 'dgawWyPtx4PRV4gNI56elfE/F12rKxhh3btQDDG1q/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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