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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8931188e84e85aaa12e9ed8ebfd5e751ea48983f40448cd304fdaaf5be12a8ff' 
  AND token = 'Ew49qcz553oII6myApUpA280b1c+vlaeFgtDhKQpOWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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