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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0117110afc6cfdb43cb4b589f6f0e4ffd35de6e428ed5dd1f3d0ef3119950b3b' 
  AND token = 'RIJBuXebgUCG4DBxmyhPrcl0PR7aMeNR2vQGDNL3rIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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