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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0997fbb3e68e85cd0c4e6ff217ef34bcd0a6bb0b9c1596a20c4062cbd93e9e' 
  AND token = 'QLZN4yjbPugbEMJnLy5PODtro66sRiNTxa7xo1BJiDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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