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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b816ba7d0ff551262367dad38b57ab73e0dfd5319677d259f52f767d981efb5d' 
  AND token = '+xFKClQJYOWyxAmQfjulCUnFqQuNnXJmHMTd5YwENYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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