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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aadb74a2e017ec1a8a60f557fc52c1db7616211bca854d4317835c9376723a5' 
  AND token = 'eLT35D9APPS9me2tOD7VAvkbkIUhQPMU07K1j+9c4e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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