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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e462e110aa21bd2ef62fd694a99b5ca2eb9375ec6623527452841d96ad57b8f' 
  AND token = 'oqF65X5H9eyQyjjUeV+bhm1tA2EmyLbRMAajI/jVHfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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