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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2972cc72d4f97814d809751a66103d2a12eeba59fb14a6e08e668f32a1891d' 
  AND token = 'xRrqntvtthQJDx7GODOM6izi8HTLw7cybzFE3Mmixrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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