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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f4876c74df7f33724f44a9a0610efaab747ad935b2f4c749b00e5b1bf7938e' 
  AND token = 'LdJEHwTcY3gvTINDTp3NbKB0sCGIBso84FAQVPUFdxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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