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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc93d6e4f472177067736fca5d171782c97c8afaa6b44af6747917d346362c30' 
  AND token = 'AvJrChvKhU1U199pkaL4Xi263CXgaRfpBYFtfNpvDDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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