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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d006bd5c09e0e6a2a701a3f73eab6a8fa2553d6e5d301a8ff79fc21b2aaa7e8' 
  AND token = 'mairrnpd7VP+H/xhk5J/rMzeI+Fboy10lT3BwCmYfP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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