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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab96fb4e9bb9f9a0ffa1f73905369ba16a3f307912a5359051d76a9420f67f75' 
  AND token = 'XFHtCDFioK8oO4uNChVQyLpwLga0Ci3czJV7ALeanhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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