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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fd1a8c52a8f43c38ddf394817194b53f26c08f4bd2444158a0aeacc147ebee' 
  AND token = 'ShRTMbwyezQGWIarbuWYWr/VWbVT7L4ieaKxY4T1w/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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