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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e496d031d3ccee28876ada2095971c8e8dd89ff42e5683a7aa048ad24d325cfa' 
  AND token = 'zhlhERr1oA93we/IabW9T/w69ZonDHp4wwfIlUJ3f1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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