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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf97e211cc01f3a989df2914be04200102d2fd66f0b2bec6bffee205a3489799' 
  AND token = '1vvtehJOQh+JnO+HHjXFbsbz81rU5LGEPMVN7aKHQXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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