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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7a35ec6093e07b36c8510482d473ed0c782b45538db55edb23d78b37659f04' 
  AND token = '6rA0la40wbek5ZS1JbeyST/t/Hf7QDAsA29tRbdZJuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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