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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0016ef4ba584e7d8d74dd7792f8b4fff09d5e22e77799564ddc6b9b5fcf7f9' 
  AND token = 'hFDQMMod/w7l36GSil46a1Ua7iEILbHpwfhvhvBXBns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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