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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebe852ce07cdb1a3addde56c1537d5d06b6bc74d0eb161c0b93d9a0e635d082' 
  AND token = 'pu4K3yhuGeZ6fkpWfMqp3A/C6h+r64L6bsd9D2R0R3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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