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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f38d651559443d9c834c05f1e66533f2e3ef70c12acdcee94d2a294093ea4a' 
  AND token = 'h10QxQ7rRXhNNLtQ+jaQsG4VRR6aR2LsLkJ2IqePW7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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