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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7964a16c829d4c69943d7963dba9bd4898b2eca7a0b5b088e2c3891784fdf39c' 
  AND token = 'FmSoy+57iy6mwDPkxoJL3uRKCdzAugbH4U7jIwM/Jww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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