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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2cf25ec4ef3bc82752a5748a7dc7269ceeb8c44251c68c0e05648b15a3a7e6' 
  AND token = 'TAVyg+ujmVi0mCQMqNe6eLRCHvnMjq1Af4b3C5SeGuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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