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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbdc12aeb8c324bb37bbd7f267dea2b32b0b3df4394c0f066de0241014c9e2f' 
  AND token = '18bBgcKYbHtERuTQ84NN2c26UT22drj7fenXB9lcsbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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