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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b85d51ddf199d4ad6c6e4707e510d8672d1a02051debaa23611e567f41f2f7a' 
  AND token = 'Y5vaL5WQablcgSbImZZcilP/UgEqG+0MdlmbFv68ms4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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