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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b55edb73600b6b885ca8e7997fdea76399078b082c46db6b2ede38b2e210c36' 
  AND token = 'sLk2EXe97eMQuGveGuF0/mSf4LsxUHdVckVQPBFKLME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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