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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95ae259a39c74fe14bc14c082a38c18d5a2434fcd088fe31c6785796b8f9809' 
  AND token = 'd93uvnQwzUNV4QFH6RaC1QQU7tmMUnkVnGi/4r0G9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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