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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a1f0ac6d5e3828c07106893a94026d67f1376b8c5303891c8a9a0edc1c8167' 
  AND token = 'SefRFgdjDKojQ7efcuu/GZnddfOzjODdu6nz9rRd0dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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