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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1faa01580ba515a945b58597e753f58481003c3b3320d4e647abd8809b25a09' 
  AND token = 'rl/UP3CTWz7rSe5KVZ++3O5k7z3Kdxy3P2NvXaCdYQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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