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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7bfed02bc8c71aa0ab96c7165bf490dede3a4963935f7bd9d07134f43ad48c' 
  AND token = 'JqZPZw5ngbXadeAaSNLafnCTyaOvXhrN5L/aQFijXF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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