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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50b987a0bada1a1dd571fbc1cf6ed432ed4f3ac96cbc0f9a26f8fe8f48a96e0' 
  AND token = 'Bv83+JJSFIyiycLpdqR8jc/uJ4m3ygCAoW1RcXKiZs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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