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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f97a53523b29bbb2865e6c1114edb6c65248494fa4eb874610cf196b16765b' 
  AND token = 'KY1H1+lA80mEAnMHFR/hr2te/jVMGZrSh84d1M8VPHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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