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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7753b250bab6584413b6e31185bc28fe2906d5b4c6d32b8a71c424ffdd71619e' 
  AND token = 'qQ5ywJ/0+cZ8mHAJECer2q4dbHREbbXo8mjR/PAA5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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