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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7697665d5a25faf66a5007a8a0ab786756c37aee4fd08d280fa7bc8b61cea876' 
  AND token = 'hqRbagwoma1J9+8ZpXHBDoflq+L1EHcfC+58SZrP+tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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