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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad832aafe4eff2fbc195ca5d27abc8ec21dcd6616ed2a723d4e005911875a9b' 
  AND token = 'zmGntl25d/lXBb8/whbJrYdOIdLxyO+XCt3YLxz9atQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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