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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bfe5127c70c72d5e53da372dffc8c6dcb721cadff7ef8f39e2d608d6103427' 
  AND token = 'KFgt6aPfAFDoP4iIfGefjF8t3DsvHeMSUCvOE71s3jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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