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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ba5c9cf30f40cabb170669a26d17af06e39c48837a4c08783a1d3c7355fdb1' 
  AND token = 'F/GDid2UBn2khCk32TVePEDA2dHB7UMzU1VgcZFqATE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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