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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17092d15710b1d220bb7331779e09acf953166619e964eb1375cf3dfa7c0c38b' 
  AND token = 'L0aSH2zCagMJAShD5y0fFYlyAQpdm3uH/5Lc+BTA7IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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