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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdebe9f4c23fa5f56f38fbed30bf225685adc937f589daec10d375b5007fccea' 
  AND token = 'LYYf43pZ8MMXi63zuk/DjaZgfyaQ2B4G23HE0eStYIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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