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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f11c0d855e8082bbf86300a14ea195fa861c7db05917dadc85b3d74563f433' 
  AND token = 'w3wkav/grmhWeU443q0K0sduzdr2DDk0FvWwxf9u0lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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