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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8580b7010d027457d55f60648b7d378431e794e6f229e1813ebd1910b46ed9e0' 
  AND token = '6084o8lfSufvJpsYL25MHKcY2PI0o5e4XG7tPbGS5d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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