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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2bf80b437b3d0e514ff9508ae89c0477e9f2483ab2af7d4b1a1d51cc440dee' 
  AND token = 'QmIIgqPb5d17vfyEKLRC4Xi2M2VU8yQD68p/68xLXpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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